12645666 has 64 divisors (see below), whose sum is σ = 31248000. Its totient is φ = 3758400.

The previous prime is 12645649. The next prime is 12645667. The reversal of 12645666 is 66654621.

It is a happy number.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

Its product of digits (51840) is a multiple of the sum of its prime factors (432).

It is a self number, because there is not a number n which added to its sum of digits gives 12645666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12645667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 36060 + ... + 36408.

It is an arithmetic number, because the mean of its divisors is an integer number (488250).

Almost surely, 2^12645666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12645666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15624000).

12645666 is an abundant number, since it is smaller than the sum of its proper divisors (18602334).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12645666 is a wasteful number, since it uses less digits than its factorization.

12645666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432 (or 426 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 12645666 is about 3556.0745211539. The cubic root of 12645666 is about 232.9774579554.

The spelling of 12645666 in words is "twelve million, six hundred forty-five thousand, six hundred sixty-six".